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Science 29 September 2006:
Vol. 313. no. 5795, pp. 1899 - 1901
DOI: 10.1126/science.1132311
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Perspectives

PLANETARY SCIENCE:
Merging Views on Mars

Jean-Pierre Bibring,1 Steven W. Squyres,2 Raymond E. Arvidson3

Rover observations and global satellite data show that the surface of Mars was wet and acidic early in its history, but rapidly became dry and oxidizing.

1J.-P. Bibring is at the Institut d'Astrophysique Spatiale, Orsay, France. E-mail: jean-pierre.bibring{at}ias.u-psud.fr

2S. Squyres is at the Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853, USA. E-mail: squyres{at}astro.cornell.edu

3R. E. Arvidson is in the Department of Earth and Space Sciences, Washington University, St. Louis, MO 63130, USA. E-mail: arvidson{at}wunder.wustl.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)